Notification Channels : Android O Features and Implementation.

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Google is here with yet another update to ease our lives,Oh yes, it’s introducing a new feature for Android O ,any guesses?….”Notification Channels”- to provide an integrated system to help users manage notifications. Isn’t it a great idea to group the notifications into channels that offer users greater control over apps notification categories!
Users can now manage most of the settings associated with notifications using system UI. The user can modify the behavior for any characteristic like Importance ,Sounds, Lights, Vibrations, Show on lock screen, Override do not disturb.
Long press to change the behavior of notification channel or even to block it.

Some of the features are:
  1. Block all notifications of app. This means notifications from app never been shown on user device.
  2. The user can state whether or not app notifications should be shown on app icon as a badge.
  3. User can also have the feature to group notification channel into separate groups. For Example, any application may support Personal or Business mode, or Child and Parent mode . This gives the option to manage notifications settings across multiple groups.

Creating a Notification Channel:

  1. Construct a notification channel group with an ID.
  2. Configure the notification channel object with any desired initial setting like alert sounds.
  3. Submit it to notification manager.
NotificationManager mNotificationManager =
        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// The id of the channel.
String id = "my_channel_01";
// The user visible name of the channel.
CharSequence name = getString(R.string.channel_name);
int importance = NotificationManager.IMPORTANCE_LOW;
NotificationChannel mChannel = new NotificationChannel(id, name, importance);
// Configure the notification channel.
mChannel.enableLights(true);
// Sets the notification light color for notifications posted to this
// channel, if the device supports this feature.
mChannel.setLightColor(Color.RED);
mChannel.enableVibration(true);
mChannel.setVibrationPattern(new long[]{100, 200, 300, 400, 500, 400, 300, 200, 400});
mNotificationManager.createNotificationChannel(mChannel);

Creating a Notification Channel Group:

If the app supports multiple user accounts, notification channel can be created for each account. It allows to manage multiple channels with identical names within a single app. Each notification channel group requires n ID that must be unique within a a package.
Following is the code showing how to implement notification channel group.
// The id of the group.
String group = "my_group_01";
// The user visible name of the group.
CharSequence name = getString(R.string.group_name);;
NotificationManager mNotificationManager =
(NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
mNotificationManager.createNotificationChannelGroup(new NotificationChannelGroup(group, name));

Creating a Notification:

To create notification, Notification.Builder.build() method is called, which returns which rerurns a notification object according to specifications given.To issue the notification, NotificationManager.notify() is a method to be called.
mNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// Sets an ID for the notification, so it can be updated.
int notifyID = 1;
// The id of the channel.
String CHANNEL_ID = "my_channel_01";
// Create a notification and set the notification channel.
Notification notification = new Notification.Builder(MainActivity.this)
        .setContentTitle("New Message")
        .setContentText("You've received new messages.")
        .setSmallIcon(R.drawable.ic_notify_status)
        .setChannel(CHANNEL_ID)
        .build();
// Issue the notification.
mNotificationManager.notify(id, notification);

 Reading Notification Channel Settings:

NotificationManager.getNotificationChannel() method is used to retrieve a single notification channel.
NotificationManager.getNotificationChannels() method is used to retrive all notification channels belonging to app.

Updating Notification Channel Settings:

Intent intent = new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);
intent.putExtra(Settings.EXTRA_CHANNEL_ID, mChannel.getId());
intent.putExtra(Settings.EXTRA_APP_PACKAGE, getPackageName());
startActivity(intent);

Deleting a Notification Channel:

NotificationManager mNotificationManager =
        (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
// The id of the channel.
String id = "my_channel_01";
NotificationChannel mChannel = mNotificationManager.getNotificationChannel(id);
mNotificationManager.deleteNotificationChannel(mChannel);

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